if_et • man page

et - "Agere ET1310 10/100/Gigabit Ethernet driver"

if_et • man page

et - "Agere ET1310 10/100/Gigabit Ethernet driver"

if_et (4)

Leading comments

Copyright (c) 2007 The DragonFly Project. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation ...

(The comments found at the beginning of the groff file "man4/if_et.4freebsd".)

NAME

et
- Agere ET1310 10/100/Gigabit Ethernet driver

SYNOPSIS

To compile this driver into the kernel,
place the following lines in your
kernel configuration file:

device miibusdevice et

Alternatively, to load the driver as a
module at boot time, place the following line in
loader.conf5:

if_et_load="YES"

DESCRIPTION

The
driver supports PCI Express Ethernet adapters based on the Agere ET1310 chip.

The
driver supports the following media types:

autoselect

Enable autoselection of the media types and options.
The user can manually override
the autoselected mode by adding media options to the
/etc/rc.conf
file.

10baseT/UTP

Set 10Mbps operation.
The
mediaopt
option can also be used to select either
full-duplex
or
half-duplex
modes.

100baseTX

Set 100Mbps (Fast Ethernet) operation.
The
mediaopt
option can also be used to select either
full-duplex
or
half-duplex
modes.

1000baseT

Set 1000Mbps (Gigabit Ethernet) operation.
The
mediaopt
option can only be set to
full-duplex
mode.

The
driver supports the following
media
options:

full-duplex

Force full-duplex operation.

half-duplex

Force half-duplex operation.

Note that the 1000baseT media type is only available
if it is supported by the adapter.
For more information on configuring this device, see
ifconfig(8).

HARDWARE

The
driver supports Agere ET1310 10/100/Gigabit
Ethernet adapters.

TUNABLES

hw.et.rx_intr_npkts

This value controls how many packets should be received
before a receive interrupt is generated.
The default value is 32.
It is recommended to set this value above 38 to prevent the host from being
livelocked under a high degree of stress.

hw.et.rx_intr_delay

This value delays the generation of receive interrupts
in units of ~4 microseconds.
It is used together with
hw.et.rx_intr_npkts
to achieve RX interrupt moderation.
The default value is 20.

hw.et.tx_intr_nsegs

This value controls how many segments (not packets) should be transmitted
before a transmit interrupt is generated.
The default value is 126.
It is recommended to set this value below 280 to prevent
the TX ring from underflowing.

hw.et.timer

This value controls how often a timer interrupt should be generated.
It is used together with
hw.et.tx_intr_nsegs
to achieve TX interrupt moderation.
The default value is 1000000000 (nanoseconds).